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USING MATERIALS TO MUFFLE NOISE

Several case histories are presented, showing how appropriate use of select materials can markedly reduce noise levels of many products and, of course, its adverse effects. Extensive use of damping materials such as polyamide trim cloth, fiberglass batting, ABS plastic sheet, fiberglass insulation, and foams in helicopters, aircraft, Diesel cars and trucks, subway wheels, and office machines is shown to be quite effective in noise reduction.